# cryptsetup 1.4.3 processing "cryptsetup --debug --key-file=- luksOpen /secure secure_unformatted"
# Running command luksOpen.                                                                                                                     
# Locking memory.
# Allocating crypt device /secure context.
# Not a block device, using free loop device /dev/loop0.
# Trying to open and read device /dev/loop0.
# Initialising device-mapper backend, UDEV is enabled.
# Detected dm-crypt version 1.11.0, dm-ioctl version 4.23.0.
# Trying to load LUKS1 crypt type from device /dev/loop0.
# Crypto backend (gcrypt 1.5.0) initialized.
# Reading LUKS header of size 1024 from device /dev/loop0
# Timeout set to 0 miliseconds.
# Password retry count set to 3.
# Password verification disabled.
# Iteration time set to 1000 miliseconds.
# Password retry count set to 1.
# Activating volume secure_unformatted [keyslot -1] using keyfile -.
# dm status secure_unformatted  OF   [16384] (*1)
# Interactive passphrase entry requested.
Enter passphrase: 
# Trying to open key slot 0 [ACTIVE_LAST].
# Reading key slot 0 area.
# DM-UUID is CRYPT-TEMP-temporary-cryptsetup-3329
# Udev cookie 0xd4d2476 (semid 65536) created
# Udev cookie 0xd4d2476 (semid 65536) incremented to 1
# Udev cookie 0xd4d2476 (semid 65536) incremented to 2
# Udev cookie 0xd4d2476 (semid 65536) assigned to CREATE task(0) with flags DISABLE_SUBSYSTEM_RULES DISABLE_DISK_RULES DISABLE_OTHER_RULES (0xe)
# dm create temporary-cryptsetup-3329 CRYPT-TEMP-temporary-cryptsetup-3329 OF   [16384] (*1)
# dm reload temporary-cryptsetup-3329  OFRW    [16384] (*1)
device-mapper: reload ioctl on  failed: No such file or directory
# <backtrace>
# Udev cookie 0xd4d2476 (semid 65536) decremented to 1
# Udev cookie 0xd4d2476 (semid 65536) incremented to 2
# Udev cookie 0xd4d2476 (semid 65536) assigned to REMOVE task(2) with flags DISABLE_SUBSYSTEM_RULES DISABLE_DISK_RULES DISABLE_OTHER_RULES (0xe)
# dm remove temporary-cryptsetup-3329  OFRW    [16384] (*1)
# temporary-cryptsetup-3329: Stacking NODE_DEL [verify_udev]
# Udev cookie 0xd4d2476 (semid 65536) decremented to 1
# Udev cookie 0xd4d2476 (semid 65536) waiting for zero
# Udev cookie 0xd4d2476 (semid 65536) destroyed
# temporary-cryptsetup-3329: Processing NODE_DEL [verify_udev]
Failed to setup dm-crypt key mapping for device /dev/loop0.
Check that kernel supports aes-cbc-essiv:sha256 cipher (check syslog for more info).
Failed to read from key storage.
# Releasing crypt device /dev/loop0 context.
# Releasing device-mapper backend.
# Unlocking memory.
Command failed with code 5: Failed to read from key storage.